Door-check mechanism.



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P. E. NORDQVIST. DOOR CHECK MEGHANISM.

APPLICATION FILED MAY s, 1910.

1,041,856. Patented o@t.22,1912.

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P. E. NORDQVIST.

DOOR CHECK MECHANISM. APPLICATION FILED MAY a, 1910.

Patented Oct. 22, 1912.

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iUNITED STATES PATENT OFFICE. f

PER ERIK NORDQVIST, OF CHICAGO, ILLINOIS, ASSIGNOR TO CONCEALED DOORCHECK COMPANY, OF SANTA BARBARA, CALIFORNIA.

DOOR-CHECK MECHANISM.

Specification of Letters Patent.

Patented Oct. 22, 19.12.

Application filed May 3, 1910. 4Serial No. 559,213.

My invention relates to improvements in door check mechanisms, and itconsists in the constructions,combinations and arrangements hereindescribed and claimed.

The object of my invention is to provide an improved reversible doorcheck mechanism, adapted for ready attachment to either the top orbottom of a door for producing an increasing checking resistance duringclosing of the door and a device within the cylinder for causing asudden release of such resistance when the door nears its closedposition.

Cross reference is made to co-pending applications Serial Nos. 559207,559208, 559209, 559210, 559211 and 559214, filed by applicant on May 3,1910, which show general features of construction shown but not claimedin this application, which is drawn to an improved construction providedwith means within the movable cylinder for causing a sudden release ofthe checking resist ance when the door nears its closed position.

I will describe my invention more in detail by reference to theaccompanying draw ings illustrating the preferred embodiment thereof, inwhich- Figure 1 is a partial sectional view of my improved door check;Fig. 2 is a detail view of my improved construction in connection withthe cylinder; Fig. 3 is a sectional view showing more in detail thecoperation between the devices of Fig. 2, and the remainder of thecylinder; Fig. t is a top view showing the connection between the doorand the hinge; and Fig. 5 is a cross-sectional view on lines 5 5 of Fig.3.

My improved door check consists of sets of draw springs 1, 2, whichimpinge against an abutment 3, and surround two stationary tubes 4f and5. The opposite ends of the springs press against ears 6 and 7, providedupon a cylinder, which cylinder has a head 9. The head 9 has a chamber10, which conn ects by means of a duct 11 with the interior of thecylinder 8. The head 9 is screwed into the cylinder 8 in such mannerthat when the head is removed the cylinder can be properly bored fromits left hand eX- tremity, if so desired. The chamber `10 has a ballvalve 12, seated preferably upon a lead seat 13, below which I provide awasher of fiber or similar' material, all of which parts forming thevalve seat are then held in place by means of the screw-threaded nut 15.From this, it will be apparent that the ball valve 12 permits fluid toenter the cyl-` inder at its left hand extremity, but prevents itsreturn through the same opening.V

A projection 16 prevents the ball from closing the aperture of the duct11. The cylinder is connected, by means of the bar 17, with a link 18,which link, by means of a bolt 20, is pivotally fastened by a bolt 21 tothe hinge. Suitable packing prevents egress of fluid through theopening, and accommodates the bar 17.

The entire door check is inclosed by a shell 23, which engages a portionof the abutment 3 at one end, and is closed by a cap 24 at the otherend, thus to maintain fluid in said door check proper. When the door isopened, the link 18 and arm 17 draw the cylinder S to the left, againstthe .action of the draw springs 1 and 2, at the same time permittingliquid or other suitable fluid, which lls the door check up to about thelower edge of the tube 25, to enter the cylinder through the valve 12. vThe precipitate return of the door, under the actuation of the springs 1and 2, is then prevented by a piston 26, fastened upon the piston rod27, which piston rod is loosely mounted in an open head, or bridge, 28.A spring 29, acting against the piston and the head, serves to hold thepiston in its left-hand position. The piston has a longitudinal bore 30,through which the liquid in the cylinder can pass through a nozzle 31,the opening of which nozzle is closed by a valve 32, through the agencyof an adjustable valve actuating rod 33, which holds the valve 32slightly away from its seat. The action of the draw springs tending topush the cylinder toward the right forces the liquid in the cylinderpast the valve 32 in a small quantity, so as to allow the door to closeslowly. The valve 32 is held in its place by a screw 34 fastened in thehead 23. The rod 33 extends through the abutment 3, through suitablepacking 34', and ends in a screw 35, by means of which the rod 33 can beadjusted so as to open the valve 32 more or less as it is desired, thusproviding an adjustable feature for the action of the door check. Aspring 36 holds the valve 32 against its seat, which spring is held inplace by a pin 37. The rod 33 has a hinged extremity 38, which servesthe purpose of permitting the door to close more slowly as it approachesits closed position. This is due to a projection 39 upon the ear 6,which projection, as the cylinder moves toward the left, elevates thejointed rod 33 and extension 38, so as to press the valve 32 fartheraway from its seat. As the door approaches its normal or closedposition, it will be seen that the projection 39 permits the lowering ofthe hinge portion of the rod 33, thereby reducing its effective length,and gradually bringing the valve 32 against its seat to make the doorclose more slowly. The rod 33 and its eX- tremity 38 thus serve a dualpurpose, making a permanent adjustment of the action of the valve 32,and at the same time a variable adjustment in the course of eachoperation.

I provide a non-metallic bushing L10 between the elements 13 and 15 asshown.

IVhile I have herein shown and particularly described the preferredembodiment of my invention, I do not desire to limit myself to theprecise construction and arrangement as herein set forth, but

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

In a door check and closer, the combination of a movable cylinder, apiston therefor, a shiftable valve for throttling the escape of fluidfrom said cylinder, resilient means tending to maintain said valve inclosed position, a hinged member engaging said shiftable valve, meansfor swinging said hinged member to increase the throttling action ofsaid Valve during the stroke of said piston, and means within saidcylinder for permitting free escape of fluid from said cylinder duringthe iinal portion of the piston stroke.

In witness whereof, I hereunto subscribe my name this 9th day of MarchA. D., 1910.

PER ERIK NORDQVIST. Witnesses:

HAZEL JONES, A. LYDA JONES.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C. 1

